Silicon Investor (SI) -- The First Internet Community

STOCKTALK

We've detected that you're using an ad content blocking browser plug-in or feature. Ads provide a critical source of revenue to the continued operation of Silicon Investor. We ask that you disable ad blocking while on Silicon Investor in the best interests of our community. If you are not using an ad blocker but are still receiving this message, make sure your browser's tracking protection is set to the 'standard' level.

Technology Stocks : Wolf speed -- Ignore unavailable to you. Want to Upgrade?

To: Guy Gordon who wrote (1984)	2/10/2000 4:03:00 PM
From: FLSTF97	Respond to of 10713

FWIW, I saw that HP/Agilent has developed a new way to extract more light from LEDS that involves simply shaping. Essentially instead of having the LED shaped like two books stacked on one another, they use an inverted pyramidal shape. I didn't explore it in detail so I'm not sure of the mechanism. Probably has to do with the incidence angle of the light to the periphery surface. In the clip you posted this line seems counter intuitive as it relates to the semiconductor layers: Transparent substrates and thick semiconductor layers increase the extraction efficiency. I would think that thicker layers means more trapping of the light generated at the interface. Could be they mean the depletion layer thickness. In general I agree with your original response to Lucius, except that I would think that if you could make at least one of the layers thin enough you might extract some small percentage more light. OTOH I'm not sure that is feasible within the constraints of the device parameters itself (I'm thinking the doping concentrations and field strengths of the various layers.) This probably doesn't help sort out the situation any better, sorry Lucius, but I wouldn't be expecting any quantum leaps in performance by using more transparent materials. FATBOY